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Q. A. An ecologist studying desert plants performed the following experiment. She staked out two identical plots that included a few sagebrush plants and numerous small annual wildflowers. She found the same five wildflower species in similar numbers in both plots. The she enclosed one of the plots with a fence to maintain kangaroo rats, the most common herbivores in the area. After two years, four species of wildflowers were no longer present in the fenced plot, but one wildflower species had increased dramatically. The unfenced control plot had not changed significantly in species composition. By means of the concepts discussed in the chapter, what do you think happened?
B. supposes that you have been chosen as the biologist for the design team implementing a self-contained space station to be assembled in orbit. It will be stocked with organisms you choose, creating an ecosystem that will support you and five other people for two years. Explain the main functions that you expect organisms to perform. List the types of organisms you would select, and explain why you chose them.
The tRNA in the E site will leave and migrate to its aminoacyl-tRNA synthetase d. where the tRNA will be recharged with the correct amino acid.
Clostridium and Streptococcus are both catalase-negative. Streptococcus grows by fermentation. Why is Clostridium killed by oxygen, whereas Streptococcus is not.
Cancer patients undergoing chemotherapy are normally more susceptible to infections. However, a patient receiving an antitumor drug that inhibited cell division was resistant to salmonella. Provide a possible mechanism for the resistance.
Barbara McClintock, famous for discovering that genes might move within genomes, had her meticulous work ignored for nearly 4 decades, but eventually won the Nobel Prize. Why was her work so distrusted.
According to ABC model of floral development, which genes would be expressed in a showy ornamental flower with multiple sepals and petals but no stamens or carpels.
What will the results be for each plant if light only in the 650 nm range is supplied? 500 nm range? 450 nm range? Put in plain words.What colour is each plant? Give details.
If the mutation is in mitochrondrial DNA, will the four haploid cells probably be all Pyr-, all Pyr+, or a combination? What if the mutation is in nuclear DNA. Why is mitochondrial function critical for growing on pyruvate.
Roger has arthritis and has been taking prednisone (a glucocorticold) at prescribed levels for two months. He isn't feeling well and complains of repeated colds. He is puffy (edematous). Describe the reason for these symptoms.
On average, how many complete turns would be in each chromosome. The human gametes have about 3 billion bp of DNA in their chromosomes.
Explain how tail length is inherited. Indicate how many gene pairs are at work and designate the genotypes of the two parents and lf the F1 offspring.
Schupack attempted to exercise right in first refusal McDonalds would not recognize the right in Schupack, claiming that it was personal to Copeland and so non-assignable without their consent. Schupack brought an action for specific performance, req..
What does this show about the relation between voluntary and involuntary reflex movement. If the bacteriorhodopsin molecules were randomly oriented, would you expect ATP to be synthesized? Give details about the answers.
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